Scrubbing / forward / rewind: arrow right, arrow left keys Jump to start: Home or `s` , you can also click/tap the lesson part again (the numbers above player) Go to next part: PageUP or End. ( iOS: swipe right or left over video ) Volume: ArrowUp / ArrowDown keys Go to any part: Number keys (combinations also possible) Pause or play: `k` or space key Fullscreen: `f`, esc to close

And the two first strings played at the same time with different rhythms. The objective here is to keep that line undisturbed while playing the other line. Studies 23 and 24 have the extradifficulty to not play with your index on the beat.

Main video is 80 bpm.
Explanatory videos are 50 bpm
There are some comments on explanatory videos.